These are the two FireSticks correct?
You logs show a Fire TV Stick 4K - 1st Gen (2018) and a Fire TV Stick - 2nd Gen (2016-2019).
The only other devices I see in the logs are an iPhone and Safari browser.
There are other threads reporting similar issues with Android TV devices. However, it is not affecting all users. You might follow this thread, where others are reporting similar issues.
The release numbers for different devices do not align. 7.19 is the current version for iOS devices. 8.18.2.25850 is the current version in the Amazon app store.
Yeah, that version is around a year old. An update, if available, may not fix the problem, but there have been a lot of bug fixes and new features added since 1.18.6 was released.
